Add virtual joystick output for macOS

Based of the foohid IOKit driver for implementing virtual HID devices.

Issue: #236

1 files changed, 51 insertions, 0 deletions

diff --git a/proto-iokit-foohid/iokitprotocol.cpp b/proto-iokit-foohid/iokitprotocol.cpp
new file mode 100644
index 00000000..4af6ad5b
--- /dev/null
+++ b/proto-iokit-foohid/iokitprotocol.cpp
@@ -0,0 +1,51 @@
+/* Copyright (c) 2017, Eike Ziller                                               *
+ *                                                                               *
+ * Permission to use, copy, modify, and/or distribute this software for any      *
+ * purpose with or without fee is hereby granted, provided that the above        *
+ * copyright notice and this permission notice appear in all copies.             *
+ */
+
+#include "iokitprotocol.h"
+
+#include "foohidjoystick.h"
+#include "iokitprotocoldialog.h"
+
+#include <QDebug>
+
+IOKitProtocol::IOKitProtocol()
+{
+    joystick = std::make_unique<FooHIDJoystick>("OpenTrack Virtual Joystick",
+                                                "SN 983457");
+    if (joystick->hasError())
+        qWarning("%s\n", qPrintable(joystick->errorMessage()));
+}
+
+bool IOKitProtocol::correct()
+{
+    return joystick && !joystick->hasError();
+}
+
+static uint8_t valueToStick(FooHIDJoystick *stick, double min, double value, double max)
+{
+    return uint8_t(qBound(stick->minValue(),
+                   int(round((value - min) * stick->range() / (max - min) - stick->minValue())),
+                   stick->minValue() + stick->range()));
+}
+
+void IOKitProtocol::pose(const double *headpose)
+{
+    const uint8_t x  = valueToStick(joystick.get(), -75., headpose[0], +75.);
+    const uint8_t y  = valueToStick(joystick.get(), -75., headpose[1], +75.);
+    const uint8_t z  = valueToStick(joystick.get(), -75., headpose[2], +75.);
+    const uint8_t rx = valueToStick(joystick.get(), -180., headpose[3], +180.);
+    const uint8_t ry = valueToStick(joystick.get(), -180., headpose[4], +180.);
+    const uint8_t rz = valueToStick(joystick.get(), -180., headpose[5], +180.);
+    joystick->setValue({x, y, z, rx, ry, rz});
+}
+
+QString IOKitProtocol::game_name()
+{
+    return QString();
+}
+
+OPENTRACK_DECLARE_PROTOCOL(IOKitProtocol, IOKitProtocolDialog, IOKitProtocolMetadata)